3v4l.org

run code in 300+ PHP versions simultaneously
<?php class A { private $func = null; public function __construct($func) { $this->func = $func; } public function exec() { $this->func(); } } $a = new A(function() { echo 'works'; }); $a->exec();
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
Fatal error: Uncaught Error: Call to undefined method A::func() in /in/R67L7:11 Stack trace: #0 /in/R67L7(19): A->exec() #1 {main} thrown in /in/R67L7 on line 11
Process exited with code 255.
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Fatal error: Call to undefined method A::func() in /in/R67L7 on line 11
Process exited with code 255.

preferences:
197.91 ms | 402 KiB | 331 Q